Speaker
Dr
Sebastien Renaux-Petel
(University of Cambridge)
Description
We consider a multi-scalar-tensor model of gravity in which the action contains higher-order derivatives of the scalar fields without introducing extra propagating degrees of freedom. In the context of an inflationary era, we study the background evolution of this model as well as the linear and non-linear properties of the cosmological fluctuations it generates. Orthogonal non-Gaussianities are shown to arise for the first time in a concrete model and new shapes of non-Gaussianities are identified.
Primary authors
Dr
Kazuya Koyama
(University of Portsmouth)
Dr
Sebastien Renaux-Petel
(University of Cambridge)
Dr
Shuntaro Mizuno
(University of Portsmouth)
